Mu Gia Pass, Vietnamese Deo Mugia, mountain pass in the Annamese Cordillera (Chaîne Annamitique) between northern Vietnam and Laos, 55 miles (90 km) northwest of Dong Hoi, Vietnam. The pass lies 1,371 feet (418 m) above sea level and carries the road from Tan Ap in Vietnam to Muang Khammouan (formerly called Thakhek) in Laos, on the Mekong River. The strategic pass was the principal point of entry of the Ho Chi Minh Trail access system into Laos and was heavily bombed during the Vietnam War (1955–75).

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elaborate system of mountain and jungle paths and trails used by North Vietnam to infiltrate troops and supplies into South Vietnam, Cambodia, and Laos during the Vietnam War. The trail was put into operation beginning in 1959, after the North Vietnamese leadership decided to use revolutionary...